352 NEW YORK STATE MUSEUM 



3400 i4f^- type Hall. Paleontology of New York. 1859. v. 3, 



pi. 63, fig. 8. 



Helderbergian Schoharie N. Y. 



3401 JL2.J22. TYPE Hall. Paleontology of New York. 1859. v. 3, 



pi. 63, fig. 9a, 9b. 



Helderbergian Schoharie N. Y. 



Platyceras symmetricum Hall 



3402 loin TYPE piatyceras symmetricum Hall. Descrip- 



tions of new species of fossils from the Upper Helderberg, 

 Hamilton and Chemung groups. 1861. p. 6. 



Hall. Illustrations of Devonian fossils. 1876. Gaster- 

 opoda, pi. 3, fig. 22-24. 



Hall. Paleontology of New York. 1879. v. 5, pt 2, 

 pi. 3. fig. 22-24. 



Hamilton shales West Bloomfield, Ontario co. N. Y. 



Platyceras thetis Hall 



34 3 iojp.4 TYpE platyceras thetis Hall. Descriptions of new 



species of fossils from the Upper Helderberg, Hamilton 

 and Chemung groups. 1861. p. 4. 



Hall Illustrations of Devonian fossils. 1876. Gaster- 

 opoda, pi. 3, fig. 13, 14- 



Hall. Paleontology of New York. 1879. v. 5, pt 2, 



pi. 3, fig. 13, 14. 



Hamilton shales West Bloomfield, Ontario co. N. Y. 



3404 jjljia type Hall. Illustrations of Devonian fossils. 1876. Gas- 



teropoda, pi. 3, fig. 15. 



Hall. Paleontology of New York. 1879. v. 5, pt 2, 



pi. 3, fi g- »5- 



Hamilton shales Canandaigua lake, N. Y. 



C. A. White and C. Van Deloo, coll. i860 

 , 40 r l&JgSA type Hall. Illustrations of Devonian fossils. 1876. Gas- 

 teropoda, pi. 3, fig. 16. 



Hall. Paleontology of New York. 1879. v. 5, pt 2, 



pi. 3, fig. 16. 



Hamilton shales Bellona N. Y. 



J. W. Hall and C. Van Deloo, coll. 1866 



Platyceras thetis? var. subspinosum Hall 

 340 6 uu.25 TYPE platyceras thetis? var. subspinosum 

 Hall. Illustrations of Devonian fossils. 1876. Gaster- 

 opoda, pi. 3, fig. 30. 



